diff --git a/includes/cpp_redis/core/client.hpp b/includes/cpp_redis/core/client.hpp
index e3ac14e0..4ef91582 100644
--- a/includes/cpp_redis/core/client.hpp
+++ b/includes/cpp_redis/core/client.hpp
@@ -808,6 +808,8 @@ namespace cpp_redis {
 
 			std::future<reply> exec();
 
+			client& exists(const std::string& key, const reply_callback_t& reply_callback);
+		
 			client &exists(const std::vector<std::string> &keys, const reply_callback_t &reply_callback);
 
 			std::future<reply> exists(const std::vector<std::string> &keys);
diff --git a/sources/core/client.cpp b/sources/core/client.cpp
index 659c0498..915d9a13 100644
--- a/sources/core/client.cpp
+++ b/sources/core/client.cpp
@@ -1039,6 +1039,13 @@ namespace cpp_redis {
 		return *this;
 	}
 
+        client&
+        client::exists(const std::string& key, const reply_callback_t& reply_callback) {
+          std::vector<std::string> cmd = {"EXISTS", key};
+          send(cmd, reply_callback);
+          return *this;
+        }
+	
 	client &
 	client::exists(const std::vector<std::string> &keys, const reply_callback_t &reply_callback) {
 		std::vector<std::string> cmd = {"EXISTS"};